Frequently asked questions
Do I need to send e-invoices?
That depends on where you and your customers are. In Belgium, e-invoices between businesses have been compulsory since 1 January 2026. In Germany every business must be able to receive them, and sending them becomes compulsory from 2027. Across the EU, invoices to businesses in other EU countries must be e-invoices from July 2030. The page on e-invoicing rules has the details per country.
Does EInvoiceFix send my invoices?
No. You download a valid Peppol UBL file and send it through your accounting software, a Peppol provider, or by email if your customer accepts that. That way you stay in control of what goes out.
Which files can I upload?
Excel (.xlsx), CSV, PDF, and e-invoices in UBL, CII, Factur-X or ZUGFeRD format, up to 20 MB. You can also start from a blank invoice, or download our Excel template.
Are my invoices stored?
No. Files are processed in memory and discarded as soon as you have your result. We only keep your account and billing details, and a count of invoices for your plan.
What if something is missing from my invoice?
We list in plain language what the official rules require, such as a buyer reference or VAT category, and where to fill it in. You can download the e-invoice as soon as it passes every rule.
How reliable is reading a PDF?
A PDF with an embedded e-invoice, such as Factur-X or ZUGFeRD, is read exactly. An ordinary PDF is read automatically, which can contain mistakes, so we mark values we're unsure of and you confirm them before downloading.
Which countries are supported?
Files follow Peppol BIS Billing 3.0, which is used in Belgium, the Netherlands and many other countries. It meets the European standard EN 16931, which Germany accepts and on which France's formats are based. Poland and Italy use their own national formats, which we don't produce.
Can I use it from my own software?
Yes. The Pro and Business plans include a documented REST API for importing, checking and exporting invoices.
Which languages are available?
The site, the converter and the PDF invoices are available in English, Dutch, German and French. Messages from the official rules are published in English only.
Is the validation tax or legal advice?
No. It shows whether an invoice meets the official technical rules. You remain responsible for the content, such as the right VAT rate. Ask your tax adviser if you're unsure.